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Catalytic converters rarely "plug" up unless your engine isn't running properly (ie. running very rich or burning oil). All the newer vehicles have an O2 sensor to monitor the converters performance so if there was a problem the check engine light would come on. The easiest way to tell if there is a problem with the converter is to take out an upstream O2 and start the engine. If there is a problem with the converter you will notice a big difference in power when you rev the engine. This may set off your check engine light but it is the easiest way to check it without a back pressure gauge.
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